[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 51.823422][ T25] audit: type=1800 audit(1563958717.480:25): pid=8317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 51.843288][ T25] audit: type=1800 audit(1563958717.480:26): pid=8317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 51.863608][ T25] audit: type=1800 audit(1563958717.480:27): pid=8317 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.169' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 63.483226][ T8470] IPVS: ftp: loaded support on port[0] = 21 [ 63.537362][ T8471] ------------[ cut here ]------------ [ 63.543205][ T8471] WARNING: CPU: 1 PID: 8471 at fs/overlayfs/file.c:55 ovl_real_fdget_meta.cold+0x11/0x1e [ 63.553000][ T8471] Kernel panic - not syncing: panic_on_warn set ... [ 63.559568][ T8471] CPU: 1 PID: 8471 Comm: syz-executor111 Not tainted 5.2.0+ #71 [ 63.567172][ T8471] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.577218][ T8471] Call Trace: [ 63.580498][ T8471] dump_stack+0x16f/0x1f0 [ 63.584863][ T8471] ? ovl_read_iter+0x2a0/0x363 [ 63.589620][ T8471] panic+0x2dc/0x755 [ 63.593507][ T8471] ? add_taint.cold+0x16/0x16 [ 63.598166][ T8471] ? __kasan_check_write+0x14/0x20 [ 63.603252][ T8471] ? __warn.cold+0x5/0x4c [ 63.607602][ T8471] ? __warn+0xe7/0x1e0 [ 63.611677][ T8471] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 63.617209][ T8471] __warn.cold+0x20/0x4c [ 63.621430][ T8471] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 63.626952][ T8471] report_bug+0x263/0x2b0 [ 63.631272][ T8471] do_error_trap+0x11b/0x200 [ 63.635852][ T8471] do_invalid_op+0x37/0x50 [ 63.640247][ T8471] ? ovl_real_fdget_meta.cold+0x11/0x1e [ 63.645767][ T8471] invalid_op+0x23/0x30 [ 63.649940][ T8471] RIP: 0010:ovl_real_fdget_meta.cold+0x11/0x1e [ 63.656208][ T8471] Code: e9 b3 fd ff ff e8 0c 68 4f ff e9 fb fd ff ff e8 02 68 4f ff e9 15 fe ff ff e8 b8 a6 15 ff 48 c7 c7 a0 45 b3 87 e8 c0 db ff fe <0f> 0b 41 bc fb ff ff ff e9 68 c6 ff ff e8 9a a6 15 ff 48 c7 c7 a0 [ 63.675897][ T8471] RSP: 0018:ffff8880a1bffdc0 EFLAGS: 00010286 [ 63.681945][ T8471] RAX: 0000000000000024 RBX: 0000000004048000 RCX: 0000000000000000 [ 63.689903][ T8471] RDX: 0000000000000000 RSI: ffffffff815b9de2 RDI: ffffed101437ffaa [ 63.697854][ T8471] RBP: ffff8880a1bffdf0 R08: 0000000000000024 R09: ffffed1015d26079 [ 63.705891][ T8471] R10: ffffed1015d26078 R11: ffff8880ae9303c7 R12: 000000000000a000 [ 63.713865][ T8471] R13: ffff88809bc592c0 R14: ffff88809bc59338 R15: ffff8880898e0460 [ 63.721856][ T8471] ? vprintk_func+0x82/0x11c [ 63.726436][ T8471] ovl_llseek+0x105/0x3b0 [ 63.730762][ T8471] ? ovl_write_iter+0xc20/0xc20 [ 63.735615][ T8471] ? mutex_lock_nested+0x16/0x20 [ 63.740613][ T8471] ? ovl_write_iter+0xc20/0xc20 [ 63.745459][ T8471] ksys_lseek+0x116/0x1b0 [ 63.749944][ T8471] __x64_sys_lseek+0x73/0xb0 [ 63.754523][ T8471] do_syscall_64+0xfd/0x6a0 [ 63.759012][ T8471] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 63.764881][ T8471] RIP: 0033:0x441ce9 [ 63.768755][ T8471] Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 63.788439][ T8471] RSP: 002b:00007ffcff68e398 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 [ 63.796839][ T8471] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441ce9 [ 63.804951][ T8471] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003 [ 63.812995][ T8471] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 63.820943][ T8471] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 63.828895][ T8471] R13: 0000000000402af0 R14: 0000000000000000 R15: 0000000000000000 [ 63.838408][ T8471] Kernel Offset: disabled [ 63.842878][ T8471] Rebooting in 86400 seconds..